Respiratory System Mcqs
Q.1: During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?`
A. More negative
B. Less negative
C. Positive
D. Equal to the intra alveolar pressure$
Q.2: The major sign of hypoventilations_____________?0
A. Cyanosis
B. Dyspnea
C. Hypercapnia
D. Hypoxia
Q.3: Most effective method of assessing breathing is by measuring____________?I
A. Tidal volume
B. Respiratory rate
C. Alveolar ventilation
D. FEV 1
Q.4: Oxygen dissociation curve shifts to the right by all of the following except_____________?Z
A. Rise in temperature
B. Rise in carbon dioxide tension
C. Rise in pH
D. Rise in H+ ion
Q.5: The best stimulator of respiratory center is____________?9
A. Decrease in arterial carbon dioxide level)
B. Increase in arterial carbon dioxide level)
C. Increase in arterial oxygen level!
D. None of the above
Q.6: What effect does hyperventilation have on the oxygen binding affinity of hemoglobin ?U
A. P50 and oxygen affinity decrease
B. P 50 and oxygen affinity increase!
C. P 50 decreases and the oxygen affinity increases0
D. P50 increase and the oxygen affinity decreases.
Q.7: During the initial part of inspiration, which of the following does not occur ?O
A. Intrapulmonary pressure falls
B. Intra thoracic pressure rises
C. Intra-abdominal pressure rises
D. The partial pressure of O2 in dead space rises.
Q.8: Cyanosis or bluish coloration of skin and mucus membrane depends upon______________?T
A. The relative proportion of reduced and oxygenated hemoglobin<
B. The absolute amount of reduced hemoglobin)
C. Thickness of the skin
D. Fragility of capillaries
Q.9: Limitation of inspiration by vagal lung inflation signals is called the______________?V
A. Autonomic reflex
B. Bainbridge reflex
C. Herring Breur reflex
D. Dynamic stretch reflex
Q.10: Smoking causes_____________?
A. Ciliary motility
B. Cellular hyperplasia
C. Mucous secretion
D. All of the above

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